SelfPub: Hello world

Hello everyone. I once saw how some people brag about their winnings in online casinos that I almost fell off my chair ... I wonder if it is true that you can really win in a casino? Or is it all kind of doing it on purpose so that we, like naive fools, would run to play and invest our hard-earned money in casinos? Have you ever won in a casino? I would like to know the whole truth, without embellishment.